forensicsmedium
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SPbCTF
Task: PCAP file with network traffic, find what was downloaded and extract the flag. Solution: Reassemble TCP streams to extract BitTorrent piece messages, reconstruct the downloaded PNG file, and analyze image watermark using channel difference to reveal the flag.
$ ls tags/ techniques/
bittorrent_piece_extractiontcp_stream_reassemblyimage_watermark_analysis
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